Foundation-anchor for bridges



PATENTED SEPT. 20, 1904.

P. P. CARVER.

FOUNDATION ANCHOR EOR BRIDGES.

APPLIOATION FILED DEO. 29. 1903.

NO MODEL.

All.

TTOHWE YS UNTTED STATES Patented September 20, 1904.

PATENT Crrrcn.

FOUNDATION-ANCHOR FOR BRIDGES.

SPECIFICATION forming part of Letters Patent No. 770,674, datedSeptember 20, 1904.

Application filed December 29, 1903. Serial No. 187,001. (No model.)

To all luk/0717, it Netty conc/57%:

Be it known that I, PLEASANT PnYToN CAR- VER, a citizen of the UnitedStates, residing at Estill Springs, in the county of Franklin and Stateof Tennessee, have made certain new and useful Improvements in FasteningBridge and other Columns in Stone Foundations. of which the following isa specification.

It is the object of my invention to provide an improved means forfastening hollow bridge columns or pipes used for other pur'- poses instone or rock foundations. To this end I have adopted and successfullyemployed the means hereinafter described, reference being' had to theaccompanying drawings, in which- Y Figure 1 is a vertical section of arock foundation and my improved apparatus applied as required inpractice, the fastening device proper being in position to be driven tocom- I plete the fastening. Fig. 2 is a similar section showing thefastening device driven and the fastening thereby completed. Fig. 3 is aperspective view of the pin or fastening device proper. Fig. 4 is across-section on the line 4 4 of 1.

In carrying out my invention a pipe A is first placed in position uponthe rocl; X--

.that is to say, the said pipe A is inserted through any obstruction,such as loose stone, gravel, sand, or mud, which may form a stratum uponthe foundation X. The next step is to insert a drill through the pipe Aand by duly operating the same bore a hole Y of due depth and diameterin the foundation X. The lower section B (see Figs. 1 and 2) of thehollow column or pipe which is to be fastened in the rock X is theninserted or dropped through the protecting-pipe A and into the hole Y,drilled in the rock. As shown in Fig. l, this pipe isnot only slotted ato, but also tapered from the top of the slots tothe bottom. In practiceI prefer to provide two such slots a, and they are preferably made ofthe length of the hole Y drilled in lthe rock. When the column or pipesection B has been duly driven, as shown in Fig. l, the next step is toinsert the expanding and fastening pin or rod C. This may be made ofgreater or less length, and it is tapered for about the same distance asthe taper and slots of the column or pipe B extend. It is also groovedlongitudinally at c for about the same distance. The taper of the pin orrod C is, however, considerably less than the taper of the column orpipe B, so thatwhen the said pin or rod C has been forced down into theposition shown in Fig. 2 the lower and slotted portion of the part Bwill be expanded as there shown, so as to firmly wedge the column orpipe in the hole Y. It will be understood that the normal diameter ofthe part B is lout a fraction less than the diameter of the drill bywhich the hole Y is formed, so that when the part B is expanded the sameis held firmly fastened in the rock. B, Fig. 1, indicates a secondcolumn or pipe section which may be attached to the driven section B bymeans of a screw-coupling D. Thus the height ofthe column or pipe may beextended as required.

It will be understood that the pipe A sub- I serves severalfunctions-that is to say, it serves in the iirst place as a protectionfor the drill while boring the hole Y in the rock foundation by keepingfrom it loose stone, gravel, sand, Sac., and it also serves the samepurpose While the column or pipe section B is being introduced. It maybe left in position after the column B has been fastened by theexpanding pin or rod C, and thus constitute a permanent portion of thestructure, or it may be removed after column B has been duly driven andfastened. The function of the groove c in the pin C is to allow theupward passage or escape of water which may fill the hole drilled in therock. It will be understood, however, that my invention is applicable incases where no water exists, and of course in such case groove c willnot be necessary.

Incase I desire to drill a series of holes and insert a correspondingseries of columns I may provide the first protecting-pipe A with a guideA', which is illustrated in Figs. 1 and 4. The same is a longitudinalsection of a second protecting-pipe and is secured by rivets o to thecolumn or pipe A. The curved inner side of such part A serves as a guidefor another column or pipe section while be- IOO ing lowered into place.It will be understood that the pipe-columns may be arranged in astraight line or in a curved line, which may bea part of a circle orotherwise, as conditions require.

Having thus'described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

` l. The improved apparatus for the purpose specified, comprising acolumn or pipe having its lower end slotted lengthwise, a pin or rodadapted to be driven into such column and of such relative diameter thatwhen forced into the slotted portion of the column it expands thelatter, and a protecting-pipe adapted to surround and inclose thecolumn, the same resting in practice upon the top of the foundation,substantially as described.

2. The improved apparatus for the purpose specified, comprisingahollowcolumn or pipe having its lower end slotted and tapered, ay

pin or rod whose lower portion is'tapered and grooved, the same being'adapted to be driven in the column or pipe and to expand the lowercontracted portion of the same, substantially as described.

3. The improved apparatus for the purpose specified, comprising a hollowcolumn or pipe having its lower end slotted and tapered, a pin or rodadapted to be driven in said pipe and made of suoli relative diameterthat it expands the, slotted portion of the same when forced to itslowest position, and a protecting-pipe adapted to inclose the drivencolumn or pipe and to rest in practice upon the top of the stonefoundation, substantially as described.

4f. The improved apparatus for the purpose specified,comprising a hollowcolumn or a pipe havingits lower end slotted longitudinally and alsotapered, a pin or rod adapted to be driven into such column and having'its lower portion slightly tapered but to a less degree than the column,and also grooved, and a protectingpipe which incloses the portion of thecolumn projecting above the stone foundation` substantially asdescribed.

5. In an apparatus for the purpose specified, thc combination with ahollow column or pipe adapted to be driven in a hole in a stonefoundation, of a protecting-pipe inclosing the portion of the column orpipe which projects above the foundation, and a column or pipe guideconsisting of a longitudinal section, of a pipe, the same being rigidlysecured to the protecting-pipe and arranged parallel therewith, and itsconcave side being outward, substantially as described.

6. The combination with astone foundation, having va hole drilledperpendicularly therein, of a bridge or other hollow supportingcolumn,whose lower portion is slotted longitudinally and also tapered, forabout the length of the drill-hole, a pin or rod having nearly the innerdiameter of the column or pipe, and tapered and grooved longitudinallyin its lower portion, the same being driven as described, whereby thelower portion of the column is expanded and thereby fastened in thedrill-hole, substantially as described.

7. rlhe combination with a stone foundation, having a drill-holeperpendicular to the surface, of a-hollow column or a pipe whose lowerportion is slotted longitudinally and also tapered, preferably for aboutthe length of the d lill-hole, an expanding rod or pin adapted to bedriven in said column and to expand the lower portion`of the same, and aprotectingpipe which rests upon the foundation and surrounds a portionof the column or pipe that projects above the foundation, substantiallyas described.

PLEASANT PEYTON CARVER.

Vitnesses:

K. E. RANDALL, J. L. GIRTON.

